# What is the meaning of Mercalli scale?

Definition of Mercalli scale. : a scale of earthquake intensity ranging from I for an earthquake detected only by seismographs to XII for one causing total destruction of all buildings.

Moreover, what is the definition of Modified Mercalli scale?

The Modified Mercalli Intensity Scale. The effect of an earthquake on the Earth’s surface is called the intensity. The intensity scale consists of a series of certain key responses such as people awakening, movement of furniture, damage to chimneys, and finally – total destruction.

How are the Mercalli scale used to measure earthquakes?

This measures the size of the seismic waves during the earthquake. Each step in the scale is ten times greater than the previous number. This is a logarithmic scale. The amount of damage caused by an earthquake is measured by the Mercalli Scale.

## What is the Mercalli scale used to measure?

This measures the size of the seismic waves during the earthquake. Each step in the scale is ten times greater than the previous number. This is a logarithmic scale. The amount of damage caused by an earthquake is measured by the Mercalli Scale.

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## What is the definition of a primary wave?

Primary waves are alternatingly compressional and extensional, and cause the rocks they pass through to change in volume. These waves are the fastest traveling seismic waves and can travel through solids, liquids, and gases. Also called P wave See Note at earthquake.

## How does Richter scales work?

The Richter scale is a standard scale used to compare earthquakes. It is a logarithmic scale, meaning that the numbers on the scale measure factors of 10. So, for example, an earthquake that measures 4.0 on the Richter scale is 10 times larger than one that measures 3.0.

## What is the focus of an earthquake?

Epicenter-The point on the Earth’s surface located directly above the focus of an earthquake. Focus-The location where the earthquake begins. The ground ruptures at this spot, then seismic waves radiate outward in all directions.

seismograph

## What is the magnitude of the earthquake?

The magnitude is a number that characterizes the relative size of an earthquake. Magnitude is based on measurement of the maximum motion recorded by a seismograph.

## What is the name of the instrument used to measure earthquakes?

A seismometer detects the vibrations caused by an earthquake. It plots these vibrations on a seismograph. The strength, or magnitude, of an earthquake is measured using the Richter scale. The Richter scale is numbered 0-10.

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## How is the moment magnitude scale used to describe earthquake?

Describe the moment magnitude scale, and explain why it is useful in measuring earthquakes. The moment magnitude scale gives an estimate of the total energy released by an earthquake. It can be used to rate earthquakes that happen close by or far away and of all sizes.

## How is intensity of earthquake measured?

Intensity: The severity of earthquake shaking is assessed using a descriptive scale – the Modified Mercalli Intensity Scale. Magnitude: Earthquake size is a quantitative measure of the size of the earthquake at its source. The Richter Magnitude Scale measures the amount of seismic energy released by an earthquake.

## What is a moment magnitude scale?

The moment magnitude scale (MMS; denoted as Mw or M) is one of many seismic magnitude scales used to measure the size of earthquakes. The scale was developed in the 1970s to succeed the 1930s-era Richter magnitude scale (ML).

## Where was the epicenter of the earthquake?

The epicenter is the point on the surface of the Earth directly above the hypocenter of an earthquake. The hypocenter is the place where the rupture of the plate boundary that led to the earthquake first happened.

## How is the moment magnitude scale measured?

The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. For all other earthquakes, the moment magnitude scale is a more accurate measure of the earthquake size.

## What is the magnitude scale for stars?

In astronomy, magnitude is a logarithmic measure of the brightness of an object in a defined passband, often in the visible or infrared spectrum, but sometimes across all wavelengths. The brighter an object appears, the lower the value of its magnitude, with the brightest objects reaching negative values.

## What is the most important property of a star?

Chapter 11 Stars. Mass – The single most important property that determines other properties of the star. Luminosity – The total amount of energy (light) that a star emits into space. Temperature – surface temperature, closely related to the luminosity and color of the star.

## What is the dimmest magnitude star that can be seen?

MagnitudesMagnitude -27The SunMagnitude -5Venus (the brightest planet) at its brightestMagnitude -1Sirius and Canopus (the two brightest stars)Magnitude 6The dimmest objects visible with the naked eyeMagnitude 10The dimmest objects visible with binoculars

## What is the brightest apparent magnitude?

The apparent magnitude (m) of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth. The brighter an object appears, the lower its magnitude value (i.e. inverse relation). The Sun, at apparent magnitude of −26.7, is the brightest object in the sky.

Sirius

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